Bevel method sawing



March 14, 1944. E. P. STAMM BEVEL METHOD SAWING 2 Sheets-Sheet 1 FiledJaln. 12, 1942 March 14, 1944. E P, TAMM 2,344,426

BEVEL METHOD SAWING Filed Jan; 12, 1942 2 Sheets-Sheet 2 Patented Mar.14, 1944 UNITED STATES PATENT OFFICE BEVEL METHOD SAWING Edward P.Stamm, Portland, Oreg. Application January 12, 1942, Serial No. 426,501

2 Claims.

This invention relates to an improved method of sawing logs into lumber.

An object of this invention is to provide an improved means whereby bothrectangular and bevelled lumber may be cut from a log with a minimumamount of waste and a minimum amount of handling of the log and thelumber.

Another object of this invention is to provide an improved method ofcutting logs, which is designed particularly for cutting logs so thatthe grain in the lumber is substantially perpendicular to the oppositefaces thereof.

A further object of this invention is to provide an improved method ofsawing or cutting logs into lumber which will permit the cutting of thelumber in such a manner that the knots will extend substantiallylengthwise of the opposite faces of the boards instead of at a morenearly perpendicular position with respect to the faces of the boards.

A further object of this invention is to provide an improved method ofsawing and handling lumber which will permit a small mill using lightequipment to cut the logs into the desired boards without the use ofexpensive equipment.

A further object of this invention is to provide an improved method ofradially cutting a log into lumber so as to provide bevelled or taperedside strips with the grain of each strip substantially perpendicular tothe opposite faces of the board.

A further object of this invention is to provide an improved method ofcutting boards from logs whereby a greater number of boards will havethe grain substantially perpendicular to the faces of the boards than isat present the case, and in carrying out this method, the perpendicularor vertical grain is obtained without wastage except for the wastecaused by the saw blade moving through the lumber.

To the foregoing objects and others which may hereinafter appear, theinvention consists of the novel construction, combination andarrangement of-parts as will be more specifically referred to andillustrated in the accompanying drawings, but it is to be understoodthat changes, variations and modifications may be resorted to. whichfall within the scope of the invention as claimed.

In the drawings: M

Figure 1 is a detail end elevation of a log showing the manner ofcutting the log according to the present method,

Figure 2 is an end elevation of a log showing the method of cutting thelog into rectangular lumber under the practice heretofore obtaining,FigureB is an end elevation of a log showing diagrammatically thepositions of the knots in the log, and the manner in which these knotsare cut so as to position them lengthwise of the opposite faces of theboards,

Figure 4 is a detail end elevation of a log mounted on a radial sawingapparatus whereby bevelled boards may be cut therefrom, and

Figure 5 is an end elevation showing the manner of cutting thetriangularheart section from the log Referring to the drawing the numeral l0designates generally a log which is shown in end elevation. When the logI 0 is initially brought into the mill for cutting into boards, this logI!) is cut first into two half sections, and then each half section iscut into quarters I I, l2, l3, and I4. Where it is desired to out onlyone board of suitable thickness from a quarter section, such as sectionII, the quarter section is mounted on the saw carriage with one facethereof confronting the saw which is preferably a band saw, and avertical cut I5 is made through the log section I l. The remainingsector shaped section is then mounted and supported on the saw carriageso that a triangular board I6 is cut through the right angular faces ofthe log. This provides a truncated sector shaped log body I! as shown inFigure 4. p

The truncated sector shaped section II shown in Figure 4 is then mountedon a radial log supporting device l8. The log section I1 is mounted onthe radial sawing device I8 with one fiat face l9 thereof resting on theupper side of the sawing device l8 and the other fiat or right angularlydisposed face 20 disposed in a substantially vertical position and at apoint forwardly of the axial center 2] of the radial sawing apparatus.

The radial apparatus I8 is then progressively raised, and the sawcarriage moved lengthwise past the saw in order to cut Wedge shaped orbevelled boards 22, shown in Figure 1. The radial log supportingapparatus I8 is progressively raised to bring successive portions of thelog section I! into cutting position until a final board 23 remains onthe radialv sawing. device l8. This final board is of such thickness asto prevent the saw blade from coming in contact with the log clampinghooks 24 and 25 which are a part of the radial sawing device I8.

The log Ill may also have another section thereof cut as shown bysection I2 in Fi ure 1 wherein three boards 26, 2'], and 28 areinitially cut from the quartered l g; and then the remaining sectorshaped section has a triangular heart section 29 cut therefrom so as toform a truncated sector shaped section 30. This truncated sector shapedsection 30 is then mounted on the radial sawing device l8, andsuccessive cuts are formed in the sector shaped section 30 in the samemanner as with the section l1.

Where an additional number of relatively wide boards are to be cut fromthe quartered section as shown by the quartered section l3, threevertical cuts 3| and 32 and 33 may be made through the quarteredsection, thereby forming three boards 34, 35, and 36. The opposite faceof the reduced section l3 may also have two cuts 31 and 38 made thereinparallel with the adjacent flat face of the initially quartered sectiontherebyforming fiat or rectangular boards 39 and. The remaining sectorshaped section is then shifted on the saw carriage so. as to permit thecutting of the heart section 4| from the remaining section. means of acut 42, which is made at an angle to the adjacent faces of the reducedsection after the cuts 33 and 38 have been made therein. The triangularheart sections it, and 4| are cut off for three reasons: first, toprovide operating space for the log clamping hook 25. It may easily beseen that this purpose may also be served by chopping or otherwisecutting a notch in the heart corner of the log section at the pointwhere the clamping hooks will engage or end clamping may be used;second, to

save the lumber contained in these heart sec-- tions, which has a value,and which would be cut up into sawdust if left attached to the remaininglog section; third,.to lessen the amount of wood through which the sawmust cut in sawing the bevel boards, thus reducing the work of the sawand consequently the amount of power required.

' The cutting off of varying numbers and thicknesses of vertical grainboards 26, 21, 28, 34, 35, 35, 39 and 40 is explained to show how anysize log section may be made to fit the requirements for the sawing ofany width bevel boards without loss or waste of timber and alwayssecuring an all vertical grain product.

In Figure 2 there is shown the conventional method hereinbefore used inthe cutting of a comparatively large log. In this method the log isinitially cut as indicated at thereby removing a small slab 45. The logis then formed with another cut 46 removing a fairly thick slab 41 fromwhich a rectangular board or plank 48 may be cut. The log is then formedwith a further vertical cut 49 forming a relatively thick slab or board50 which is subsequently cut as indicated by the lines 5! to form narrowboards.

After the cut 49 is made in the log, the log is turned at substantiallyright angles'and a cut '52 is made in the log anda narrow slab 53removed therefrom. A" second cut 54 is made parallel to the cut 52thereby removing a slab 55 from which a rectangular board or plank 56may be out. A further out 51 is made in the log removing a plank 58having parallel opposite faces and rounded edges. The plank 58 may thenbe out along the lines 59 ina further sawing operation as to providenarrow boards or planks. An additional cut 60 is then made in the logparallel with the cut 51 removing a further fairly thick plank 6| whichmay be cut as along the lines 52 so as to form narrow boards of desiredthicknesses. After the board or slab Bl has been cut The heart section4! iscut by a cut 63 being made in the log thereby removing a narrowslab 64.

A cut 65 is then made in the log parallel with the cut 63 removing aslab 66, and a rectangular board or plank 61 may then be cut from theslab'66. A further cut 68 parallel with the cut 65 is made in the log,removing a slab or plank G9 which may then be out along the lines 10 soas to provide narrow planks or boards. A further out H is made in thelog parallel with the cut 68 thereby removing a plank or slab 12 whichis adapted to be out along the lines 13 so as to form narrow boards orplanks.

. The remaining portion of the log is then turned through a further arcof 90 degrees, and a cut 14 is made in the outer side of the log movinga slab section 15. Another cut 16 is made in the reduced log whichisparallel with the cut 14 and which forms a fairly thin plank or board11 from which a rectangular board or plank I8 may be formed. A furtherout 19 is made through the log removing a slab or plank section which isadapted to be out along the lines 8| to form boards or planks of desiredwidth and thickness. A further out 82 is then made in the remainingportion of the log, thereby removing a rectangular plank 83 which may beout along the lines 84 to provide planks or boards of desired width andthickness.

The remaining portion of the log wil1 be substantially rectangular intransverse section, and this remaining portion may then be cut throughthe center as indicated by the line 85 and the two halves of theremaining block or plank may then be cut along the lines 85 and 81 toprovide planks or boards of the desired width and thickness.

It will be noted from Figure 2 that the log therein shown is formed witha plurality of radially arranged or extending knots 88 which extendradially about the center 89 and that these knots 88 extend angularlywith respect to the boards rather than substantially parallel with theopposite faces thereof.

It will be noted from the conventional method shown in Figure 2 thatonly a very small number of boards cut from th log have the grainsubstantially perpendicular to the opposite faces thereof. Thisprocedure forms boards which are not desirable for certain purposes,particularly from the log, the log is again turned through an arc of'90degrees and moved past the saw'with outer surfaces, and in a single loga considerable number of the boards cut therefrom are undesirable andwill not meet building specifications calling for the grain of thelumber being disposed within a range of 25 degrees of the vertical.

In Figure 3 there is disclosed th new method of cutting a log which mayhave considerable knots 90 therein. The log 9| is initially quartered asshown in Figure 1 so as to provide quarter sections 92, 03, 94 and 95.The quarter sections may then be cut parallel with one fiat face thereofas by a cut 96 to form a fiat board 91. The remaining sector shaped logsection is then out along an angular cut 98 so as to remove the heartsection 09 therefrom. The remaining lo'g section I00 is of truncatedsector shape and is mounted on the radial sawing apparatus 18, where theradial cuts l0l may be made through the sector shaped section I00 toform a plurality of wedge shaped or bevelled boards I02. 1

It will be noted that when the bevelled boards I02 are cut from thesector shaped log I00, the knots 90 extend lengthwise or substantiallyparallel with the opposite faces thereof rather than extendingsubstantially perpendicular to the oppo-site faces thereof, as the knots88 in the conventional sawing method illustrated in Figure 2.

The hereinbefore described method of sawing or cutting a log providesnot only radial cutting of the log, but also combines the radial cuttingwith the vertical or rectangular cutting of the log so that all of theboards cut from the log will be vertical grain and also a more nearlyperpendicular or true vertical grain than is possible by the methodheretofore used.

This radial cutting method also makes possible the building up oflaminated timbers of any size which will have a true vertical grainthroughout. This is done by gluing the desired number of boards togetherone on top of another, so that their thick and thin edges arealternately turned opposite.

The degree of bevel of the boards is changed by shifting the position inwhich the log section is held on the bevel sawing device. The changingof this position increases or decreases the radius of the circular arcin which the log section is moved as sawing progresses and consequentlychanges the degree of beve1 of the faces of the boards.

What I claim is: V

l. A method of cutting rectangular and beveled lumber from a quartered10g having a pair of right angular flat faces which includes initiallypositioning the log with one flat face thereof horizontal and the otherfiat face thereof vertical and adjacent the saw, making at least onevertical cut parallel with said vertical face to thereby formrectangular lumber, rotating the log to position the heart portionthereof innermost with respect to the saw and with the remaining rightangular faces disposed at an obtuse angle to the vertical, cutting atriangular heart portion, again shifting the truncated quartered log toposition one of the remaining right angular fiat faces horizontal andthe other of the right angular faces vertical with the axial center ofthe log grain closely adjacent the cutting line, and finally making aseries of cuts from the periphery of the log toward the obtuse faceformed by removal of the heart section with the log rocked toward thesaw after each cut to thereby form beveled boards, each beveled boardhaving the configuration of a truncated V in section.

2. A method of cutting rectangular and beveled lumber having the grainthereof substantially perpendicular to the opposite fiat faces thereoffrom a quartered log provided with a pair of right angular faces whichincludes initially making at least one cut parallel with each fiat face,cutting the log at an obtuse angle to said pair of flat faces to therebyremove a triangular heart portion and form a third fiat face, andfinally making a series of cuts from the periphery of the log toward theobtuse face formed by removal of the heart section substantiallyradically of the annular rings through the remaining log to thereby formbeveled boards having the configuration of a truncated v in section.

EDWARD P. STAMNE.

